You ' ll receive your first reward within ~18 - 22 h .
If your MN is in Watchdog expired mode , the active MN list ignore your MN.
FYI : I receive a reward yesterday a 22h PM , and another today at 12h30 , my MN work well without Sentinel , with the Watchdog status...
I can confirm that the watchdog expired doesn't matter with Desire. I have other coins like VIVO and INNOVA where I went through the whole process of getting the sentinel running on them...
But because of the low price of desire currently I just ignored it... and it's still earning rewards.